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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78bbeaae1fe14b2ae7264175c3f12a7883a3ff2ec359a8f5cabbb7a1425b48e7' 
  AND token = 'oPC52Yw+M5IU78E1Kk7GIvy/3KTkookbux1vcgCyA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}